Polishing machine



Jan. 13, 1931. CRANE 1,789,218

POLISHING MACHINE Filed June 16,- 192: 5 sheets-sheet' 1 55245 dew/v.5,

Jan. 13, 1931. CRANE 1,789,218

POLISHING MACHINE Filed June 16, 1925 3 Sheets-Sheet 2 Jan. 13, 1931. L. CRANE 1,789,218

POLISHING MACHINE Filed June 16, 1923 3 Sheets-Sheet 3 uwnfoz c UNITED: 'STATESTP Patented Jan. 13, 1931 LESLIE CRANE, on R TLAND, vnmvion'r, Assrenon or ONE-Earn '10 1?. 3. mm; -MANUFAGTUR ING COMPANY, or RU'ILAND, VERMONT, n conronnzrron on vnng i MONT POLISHING MACHINE Application filed June 16,

This invention relates to certain new and useful improvements in polishing machines and'more particularly to that type of machine in which a swinging arm carrying a polishing disc is mounted on a vertical standard, the object being to provide means for mounting the armeand for raising and lowering the same in position to operate on the material in the working area of the arm. A further object ofthe invention is to provide a polishing machine-in which avcentral standard'is mounted rigidly withina base and has mounted thereon a headcarryingan electric motor andan adjustably mounted sectional arm having a-polishing disc wh ch is driven by the electrical motor .in connec- 7 tion with novel means for raising and lowering the sectional arm'in the formof a frictional means which is under the control of invention, partly in section}. V-

Figure 2 is a vertical section through, the standard showing the manner of mounting theheaclcand driving shaft support;

Figure 3 is a detail side elevation of a portion of the sectional arm, partly. in sec- 7 tion,"showing the manner of operating the raising and lowering mechanism;

"Figure 4 is an enlarged section of the frictional drive for the mechanism; and I I z Figure-5 is a detailenlarged section' of the driving shaftsupporting bearing.- y

In' the drawing 1 indicates a base which is anchored toa foundation and is provided with an upwardly extending reinforced portion 2having a tubular bore Sinto which is V driven a tubular standard land securedby tending down over raising and lowering- 1923. Serial No. 645,828.

,forrlcs T pins 5-as clearly shown in Figure 2. Driven into, the top of thestandard 4 is a socketi6 provided with a shoulder .7 bearing on the upper end of, the standard 4 as clearly shown. The socket 6 is annularly reduced as shown at V8=into whichis secured a sleeve 9 forming with the socket 6anannular chamber 10 into which is adapted to extend atubular portion 11 of a head 12, said tubularportion being provided with openings 13. The lower-lend of'the tubular portion mounted on-ball bearings 14 within the'bottom of fthe chamber, lO which is adaptedjtofreceive'a lubricant" for keeping the bearings lubricated at all'tim'es.

Bolted to the'head 12iisda collarj15 pro- 7' vided with an arm 16 on which is mounted an'f carried by the collar 15. The 'co11ar15 car-.

ries a sleeve 23 which has its lower end arranged within a collar 24 having an annular extension 25 which "extends into, a cup 26 formed on the upper end of the extension of the base and in which are arranged roller b'earings'27,jsaid collar having a hood 28 exthe cup portion-"for protecting the same. 1 4 r i if 1 The collar 24: is providediwith an arm 29 having a socket 30 at its outer end'in which reduced end 20" of the drivingshaft 20.1v The beveled pinion 18 uand beveled gear 19are enis arranged a ball thrust bearing 3l-forthe closed by a housing asclearly shown so as to protectthe same from the grit and dust of I the machine when in operation;

"The construction thus fardescribed forms the main standard on which the head is re volably mounted. carrying'the motor' 'and drl'vingshaft so that the swinging sectional V be extended of an "arm33 which is provided iwith extensions 34 and 35 terminating in sleeve portions through which the drive shaft 20 extends and between whichis mounted a drive pulley 36 which is feathered on the drive shaft 20 so that it moves up and down with'the tubular portion of the arm, ,7 Mounted'within the arm 33 is a stationary screw 37 which has its upper end secured in a socket 16 of the arm 16 and on which is mounted a nut 38 provided with a beveled gear .39 engaged by a'bev ele'd pin ion 40 carried by a shaft 41"mountedinbearings 42 and 43secured to the arm 33 as clearly shown in Figure 1. The gears 39 111C140 are enclosed by a housingas clearlyshown.

The outer end of the arm 33 terminates in i tubular portions l4 and 45 in which are pulley being driven by a belt 57froni the driving pulley 36 and'the pulley carries a' belt 58 which passes over a" pulley 59 mounted on the shaft 51 in the outer frame 49.

The upper end of the driven shaft reducedasfshown at 60 on which is mounted spaced beveled gears 61 and {52 provided with v frictional cup portions '63 and 64; having" con ical inner faces adapted to beengage'd by a frictional drive member 65 keyed on the extension 60 of the shaft 54 through the medium of apin 65 working through an oppositely disposed slot in th'e ezitensiontlO and carried by a shaft 66 extending upthrough the tubular driven shaft 54; I The sliagftj66is provided with a collar 67 at its lower end'provided with oppositely disposed pins which are engaged by the bifurcated arms of ayokejfis'pivotally mounted in a bracket 69, theopposite'end of the yoke -'being-provided with a bifurcation 70 into which extends therounded end ofa bellcrank'Tl mounted in the bracket 69, said bell crank being operated bya rod 72 through the medium ,offa lever 73 arranged in posi-.

tion to berreadily manipulated by the-operator.. x ;..a y q The shaft 4clhas secured to its end agea-r 7 4 meshing with the pinions 61 and 62 so that asthe shaft 66 is raised and lowered through the operating "means controlled bynthe lever '73, the frictional member 65 can be thrown" into contact with either of the inner faces of the cups63 or 64 whereby the shaft fl-l will'be rotated in either direction in order to rotate a the screw 38 in either direction so as to. raise and'lower the'arm 33 in order t'o -p'osition the polishing disc in respect to the work being operated on.

This frictional driving means is enclosed by a housing as clearly shown and provides a novel construction in raising and lowering the swinging arm of the polishing machine which is positive in operationQ In Figure 3 of the drawing I have shown thefrictional member 65 arrangedin a neu-- tral position ,tojralloiw theldriv'en shaft 54 to rotate without op"crating the nut '38 working on, the v. screw'37 and by either raising or 65 cai ibe thrown into engagement with either of thefrictional cups so as to rotate in the desired direction, which in turn rotates "the shaft .41 and through the beveled gears 39 and 40,, the nut 38 is rotated so as to either raise or lower the frame of the polishing machine.

.In machines ofthis character it is desirable to; form a construction in which the swinging frame can be .rotatedaroundla standard and as the :weightsis notequally distributedin view of the length of :the sectional arm, itis desirable toprovide means for taking care of the side thrust, which I have accomplished and by thegparticul'ar manner of mounting, theparts, the machine is balanced.v

The head 12, collar 15, sleeve23 and collar 24.: constitute what I have termed a body,

whichis:revolublymounted on the standard on ball bearings; so that-thesame can swing around the standard-freely, the sleeve -23-con: stituting a guide on which the tubular portion of the working armis slidably mounted.

@W'hat-I'claimis a s 1 U 1. In a polishing machine, the combination witha standard, of'a body mountedon said standard-comprising spaced collars connected by asleeve, one of said collars being secured'to a head, the; upper collar being provided with oppositely disposed arms andthe lower collar with an arm, a shaft mounted in the arms of said collarsfan electricimotor carried by one of said arms, a driving vconnection'between 'said electric motor'and said loweringthe lever 73, the frictional member s shaft and-gaworking;arm slidably mounted on the CQIlllQCtlilglSlGGVG. 1 v

'2, An electric polishing :machine' having a tubular=fixed standard carrying. aibodyprovided with an electric motoigsaid body-having a driving shaft 'onone side of said standard and a-fi'xed screw ontheother side, '-a driving connection between :said motor and said driving shaft, an? arm slidably mounted on said body carrying a nut workingon said screw, a second arm carried by the outer end of the first mentioned arm provided. witha polishing disc, a drivlngconnection between said polishing disc and said drivenshaftand frictlonal driving means :for driving saidnut forraising andlowering said arm.

3. In a polishing:machineythecombina! tion with a' fixed tubular "standard, of a cylindrical body revolublymounted concentrically on said standard, thrustand radial bearings carried by said standard for said body, arms provided with bearings carried by said body, a driving shaft mounted in said bearings, an

i a grinding tool and means for driving said tool from said driving shaft.

4. A polishing machine having a revolubly mounted body carrying a fixed screw, an

arm slidably mounted on said body carrying f a nut for working on said screw for raislng and lowerlng said arm, a second arm earned by the free end of the first-mentioned arm provided with a polishing disc, a 'tubular driven shaft, means for drlving said polishing device from said tubular shaft, pinions mounted on said shaft provided with internal cup portions, an operating shaft mounted insaid tubular shaft having a double conical frictional member adapted to cooperate independently with said frictional cup-portions of said pinions, a shaft for driving said nut and a gear carried by saidshaft meshing with said pinions'.

In testimony whereof 'I' hereunto aflix my signature. y LESLIE CRANE. 

